I don't think that's fair. It's not like airlines buy planes with cash. Retailers don't pay net zero. Regardless of whether you hold the title, the lien holder has much less legal right than you do. The lien holder is not making equity (which is a point of this article). The lien holder gets no mortgage interest deduction (which is the principal point of this article). Nonetheless, the data you're looking for can be gleaned with the search term "mortgage equity withdrawal over time."